Paint spray apparatus



March 1956 J. SEDLACSIK PAINT SPRAY APPARATUS Filed Jan. 17, 1955 INVENTOR. JW dvfacs i BY '2, r a

United States Patent PAINT SPRAY APPARATUS John Sedlacsik, Garfield, N. J. Application January 17, 1955, Serial No. 482,579 1 Claim. (Cl. 299-1) This invention relates to apparatus for the electrodeposition of paints on metal or metallized objects.

The principal object of the invention is the provision of apparatus for use in connection with the depositing or coating of metal or metallized objects with coating materials, often called paint, having metal particles. Such paint or coating material provides a metallized finish.

In the electrodeposition of coating material, it is well known that a high potential is used and that the spray gun is either of positive or negative potential while the work being coated is of opposite polarity.

Where coating materials are used which contain metal particles there is an inherent tendency for the voltage to feed back through the coating material.

According to this invention, means is provided to eliminate the feed back tendency and to overcome the hazards and objections incident to feed back.

All of the above cited objects, I accomplish by means of such structure and relative arrangement of parts thereof, as will fully appear by a perusal of the description below and by various specific features which will be hereinafter set forth.

To these above and other ends and with the foregoing and various other and ancillary features and advantages and objects of my invention as will become more readily apparent as the description proceeds, my invention consists in certain features of novelty, in a mode of operation,

and in the combination, organization, and arrangement of parts as will be hereinafter more particularly pointed out in the claims hereunto annexe dand more fully described and referred to in conjunction with the accompanying drawings wherein:

Fig. 1 is a side elevational view of apparatus embodying the novel features of the invention;

Fig. 2 is a sectional elevational view on the line 22 of Fig. 1; and Fig. 3 is a sectional view on the line 3-3 of Fig. 1.

Referring to the drawings more in detail, the invention will be fully described.

Apparatus for spraying coating material or paint is represented by 2, and includes a rear member 4 and a spray end member 6. These are connected to opposite ends of elongated insulating members 8 and 10.

Air under pressure is supplied to the rear member 4 which flows through tube 8 to the member 6. Normally coating material is supplied to the member 4 and flows through tube 10 to the member 6 and, in the usual manner, the coating material is sprayed from a suitable nozzle associated with the spray end member 6 which is indicated by 12 and may be of any desired form.

The end of the apparatus 4 may be referred to as the supply end and the opposite end 6 as the discharge end of the apparatus.

The apparatus thus briefly described, and having an elongated adjusting member 4 for controlling the discharge of coating material, forms no part of the present invention except that it supports novel features of the invention.

and, as a suitable material, plastic tubing such as poly- Y ethetine has been used. The convolutions are held in place by any suitable means, such as an adhesive or the like.

The inlet end 24 of the coil is suitably connected to an outlet of a fitting 26 secured to the end member 4. Said fitting is arranged at 27 for connecting to a supply of coating material so that said coating material may pass along and through the tubing, rather than through I "the member 10, to the end member 6.

This is accomplished in various ways such as blanking off the fitting 26 at 28 and the tube 10 at 30.

A lug 32 is provided on end member 6 for connection to the ungrounded terminal of a high voltage source 33 in the manner shown in Fig. l.

The coil is of such length that the convolutions thereof provide a conduit for the coating material which is of considerable length.

Said coil offers resistance to the back flow of energy which may reach the end 6 of the apparatus through the coating being sprayed.

Thus coating material supplied to the entrance end of the coil, and which may be called metallic paint, is conducted through a circuitous conduit to the discharge end of the apparatus.

The number of convolutions may be varied so as to vary the overall length of the conduit for the metallic coating material. This will depend upon the character of the coating material, the relative potential of the end 6 of the apparatus and the work being coated, all to the end that the dangers of feed back are safely overcome.

The invention may be embodied in other specific forms without departing from the essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claim are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

Apparatus for coating objects with coating material comprising, supply end and discharge end members connected in spaced relation to opposite ends of an air tube for conducting air for atomization purposes from said supply end member to said discharge end member, a tubular insulated support disposed around and supported by said air tube, a high potential source of energy connected to said discharge end member, an elongated insulated tube member in the form of a coil disposed about and along said support providing a circuitous conduit connected at opposite ends to said supply and discharge end members and arranged to conduct coating material forwardly to said discharge end member and to resist and eliminate the feed back of energy from said discharge end member to said supply end member.

References Cited in the file of this patent UNITED STATES PATENTS 2,590,442 Miller Mar. 25, 1952 

